Elements that have 3 electrons in their outermost shell will form a ____ charge.

3+

0

3-

2 hydrogen atoms.

Given the chemical formula H2SO4,

The compound shows that the formula has 4 atoms of oxygen, one atom of sulfur and 2 hydrogen atoms.

Therefore, the number of hydrogen atom in the molecule H2SO4 is 2 hydrogen atoms.

Well, us human being rely on \(o_{2}\) (oxygen). We human beings breathe this in every day because we need it to survive. This is a good example because it explains how humans don't see \(o_{2}\) but use it every day.

Answer:

fkv  SFHHHHHHHHHCB FSSSSZCHJjjjb .SFFHHHHHHHHC

Explanation:

What do you notice about the relationship between the force strength and the size of the velocity change?

Uuuuuuu

Answer:

Newton's third law of motion states that every action, there is an equal and opposite reaction force and that forces come in pairs

The mass of a liquid with a density of 2.5 g/mL and a volume of 15 mL  is 37.5g.

Density is the measurement of quantity or mass per unit of volume in a particular substance. Its units are  grams per centimeters cube (g/cm³) or kilograms per liter (kg/l)

⇒  g/cm³ can also be written as g/mL because 1cm³ = 1mL

Volume is a measure of space. When measuring the volume of a liquid which is sometimes referred to as capacity, the units liters (L) and milliliters (mL) are used.

Mass is defined as amount of matter present in a body. Gram (g) and kilogram (kg) are the common units.

density = mass / volume

mass = density × volume

         =  2.5 g/mL  ×  15 mL.

         =  37.5 g

Since density is given in g/mL and volume is given in mL, we can keep the unit of mass in grams (g).

Thus we can conclude that the mass of liquid is 37.5g

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Answer:

\(Molar\ solubility=2.14x10^{-4}M\)

\(Ksp=3.91x10^{-11}\)

Explanation:

Hello,

In this case, given that 0.0167 grams of calcium fluoride in 1 L of solution form a saturated one, we can notice it is the solubility, therefore, the molar solubility is computed by using the molar mass of calcium fluoride (78.1 g/mol):

\(Molar\ solubility=\frac{0.0167gCaF_2}{1L}*\frac{1molCaF_2}{78.1gCaF_2} \\\\Molar\ solubility=2.14x10^{-4}M\)

Next, since dissociation equation for calcium fluoride is:

\(CaF_2(s)\rightarrow Ca^{2+}(aq)+2F^-(aq)\)

The equilibrium expression is:

\(Ksp=[Ca^{2+}][F^-]^2\)

We can compute the solubility product by remembering that the concentration of both calcium and fluoride ions equals the molar solubility, thereby:

\(Ksp=(2.14x10^{-4})(2*2.14x10^{-4})^2\\\\Ksp=3.91x10^{-11}\)

Regards.

The pressure of the gas is expected to increase in accordance to Boyle's law.

Boyle's law states that, the volume of a given mass of gas is inversely proportional to its pressure at constant temperature.

By implication, when the piston is lowered and the volume of the gas is decreased, the pressure of the gas is expected to increase in accordance to Boyle's law.

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7. D. 668 joules

8. B. 3 grams

Given

2 grams of water

6768 joules of energy

Required

Energy

Mass of water

Solution

The heat to change the phase can be formulated :

Q = m.Lf (melting/freezing)

Q = m.Lv (vaporization/condensation)

Lf=latent heat of fusion

Lv=latent heat of vaporization

7. phase change (ice to water)⇒Heat of fusion water=334 J/g

Q = 2 g x 334 J/g

Q = 668 J

8. phase change(water to vapor)⇒heat of vaporization water=2260 J/g

6768 J = m x 2260 J/g

m = 3 g

Answer:

10.77%

Explanation:

Molar mass of Cu = mass deposited/number of moles of Cu

Molar mass of Cu = 0.4391 g/6.238x10^-3 moles

Molar mass of Cu = 70.391 g/mol

%error = 70.391 g/mol - 63.546 g/mol/63.546 g/mol × 100

%error = 10.77%

Intermolecular attractions that form between nonpolar substances in water are called Hydrophobic interactions.

Intermolecular attraction refers to the attractive forces between molecules. These forces determine many of the physical properties of a substance, such as its boiling and melting points, surface tension, and viscosity. There are several types of intermolecular attractions, including hydrogen bonding, dipole-dipole interactions, and London dispersion forces.

Hydrogen bonding occurs between molecules that contain hydrogen and electronegative elements such as nitrogen, oxygen, and fluorine. Dipole-dipole interactions occur between polar molecules, where one end is positively charged and the other end is negatively charged. London dispersion forces are the result of temporary dipoles that form in nonpolar molecules and attract each other.

Intermolecular attraction plays a crucial role in the behavior of liquids and solids, and it helps to explain the properties of substances such as why some substances are liquids at room temperature, while others are solids. The strength of intermolecular attractions can be influenced by temperature, pressure, and other environmental factors, which can have a significant impact on the physical properties of a substance.

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Explanation:

It is done by only one scientist at a time.

Answer:

It uses data and observations to make conclusions

Explanation:

Scientists are very careful whilst explaining. The other guy was incorrect.

Answer:

M= ml - 45301 - 11.59M.

Explanation:

Explanation:

2x²=8

x²=8/2

x=√4

x=2

hope it helps.

Answer:

\(\huge \fbox \pink {A}\huge \fbox \green {n}\huge \fbox \blue {s}\huge \fbox \red {w}\huge \fbox \purple {e}\huge \fbox \orange {r}\)

\( {2x}^{2} = 8 \\ {x}^{2} = \frac{8}{2} \\ {x}^{2} = 4 \\ x = \sqrt{4} \\ x = 2\)

ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ

\( \huge\purple{ \mid{ \underline{ \overline{ \tt ꧁❣ ʀᴀɪɴʙᴏᴡˢᵃˡᵗ2²2² ࿐ }} \mid}}\)

Following are the effects of acid rain.

What is Acid Rain?

Acid rain is caused by the accumulation of nitric and sulfuric acids in the atmosphere. These compounds are strong acids and are very soluble in water, dissolving in droplets in clouds.

Limestone effect:

Calcium carbonate, [Ca][CO3], is a very common mineral. A limestone is a well-known form of calcium carbonate. The acid contained in acid rain reacts with carbonate ions and promotes the dissolution of calcium carbonate.

This will create a bicarbonate solution. The presence of limestone and other calcium carbonates in lakes and streams helps maintain a constant pH as the mineral reacts with excess acidity. However, acid rain can eventually exceed the buffering capacity of surface waters.

How does acid rain affect buildings made of marble and limestone?

It is mainly affected in 2 ways: dissolution and alteration. Calcite dissolves when sulfuric, sulfuric and nitric acids in polluted air react with calcite in marble and limestone. Exposed areas of buildings and statues show rough surfaces, worn materials, and loss of sculptural detail. Stoneface material can be lost anywhere or only in more reactive areas.

Hence, this is how acid rain affects.

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A gas with a volume of 3.5m³ is at 0.275 bar. The volume is reduced to 1.25 m³ while the temperature is held constant .The new gas pressure is

0.77 bar. This is based on Boyle's law.

Boyle's law, also known as the Boyle-Mariotte law or Mariotte's law (particularly in France), is an experimental gas law that explains how the volume and pressure of a confined gas relate to one another. Boyle's law is defined as follows:

If the temperature and amount of gas remain constant in a closed system, the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies.

the law can be expressed as:

P₁×V₁=P₂×V₂

Given

P₁= 0.275 bar

V₁= 3.5 m³

V₂=1.25 m³

substituting the values and solving for P₂

P₂= 0.77 bar

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Answer:

The reaction between carbon (C) and water (H2O) forms carbon monoxide (CO) and hydrogen gas (H2). The balanced chemical equation for this reaction is:

C(s) + H2O(g) -> CO(g) + H2(g)

According to this balanced equation, one mole of carbon reacts with one mole of water to produce one mole of carbon monoxide and one mole of hydrogen gas.

First, calculate the number of moles of carbon in 34 grams. The molar mass of carbon is approximately 12.01 grams/mole.

Moles of carbon = 34 grams / 12.01 grams/mole = 2.831 moles

As the stoichiometry of the reaction shows a 1:1 ratio between carbon and hydrogen, the moles of hydrogen produced would also be 2.831 moles.

The molar mass of hydrogen (H2) is approximately 2 grams/mole.

So, the mass of hydrogen produced = 2.831 moles * 2 grams/mole = 5.662 grams

Therefore, if 34 grams of carbon reacts with an unlimited amount of water, approximately 5.66 grams of hydrogen gas would be formed.

Explanation:

Approximations followed for answer.

To determine the maximum \(Fe_2(SO_4)_3\) produced, we find the limiting reactant (Fe), calculate theoretical yield (0.3383 mol), and obtain a percentage yield of 47.56%.

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Answer:

It should be c. 8 moles

The mass of the object that is acted on by a force of 200 N is 100 kg

Mass can be defined as the quantity of matter a body contains.

To calculate the mass of the object, we use the formula below.

Formula:

Where:

From the question,

Substitute these values into equation 1

Hence, the mass of the object is 100 kg.

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Answer:

The correct answer is - increase Florida's average income per person.

Explanation:

Kennedy Space Center established by NASA helped the boosting economy of Florida. Spaceport operations in Kennedy Space Center benefit Florida by a total economic impact of nearly $4 billion on Florida's economy.

This space center helped in the 7,639 jobs in 2018 and 2019 and 37 new space operation companies. These jobs increased Florida's average income per person above $91,000.

The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.

To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.

Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):

K2S -> 2K+ + S2-

Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):

MgI2 -> Mg2+ + 2I-

Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):

K+ + I- -> KI

Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):

Mg2+ + S2- -> MgS

Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:

2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS

To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).

Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:

S2- + Mg2+ -> MgS

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Answer:

There will be 216,000 energy transfer reactions

90  \(O_{2}\) molecules will be formed

Explanation:

since 2400 chlorophyll molecules = ( 1 ) \(O_{2}\) molecule

hence there will be 8 photons  absorbed in this process

for 720 absorbed photons

The number of \(O_{2}\) molecules formed = 720 / 8 = 90 molecules of \(O_{2}\) molecule formed

Total number of resonance energy transfer reactions

( 1 ) \(O_{2}\) molecule = 2400 molecules

 hence 90 molecules of \(O_{2}\)

= 2400 molecules * 90 molecules

= 216000 energy transfer reactions

The qualities Tom Walker and his wife have in common were they both were grasping and without conscience

The question has been asked from the story "The Devil and Tom Walker" by Washington Irving. As the story describes Tom's encounter with the devil, he is a complex character. However, he and his wife seem to complement each other well and have some personality traits in common. Tom and his wife are both miserly, avaricious, cruel, and morally void.

More so than her husband, Tom's stereotypically nagging, scolding wife verbally and perhaps even physically abuses him when she's not hoarding his valuables. Tom's wife courageously decides to accept Old Scratch's offer to sell her husband's soul for money when Tom first rejects it. She takes the family's silver into the swamp with her so she may haggle with the devil.

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The solubility of a substance, such as sugar, depends on several factors, including temperature, pressure, and the presence of other solutes. In this case, the student adds the same amount of sugar and tea bag to the same amount of hot water every day, but the temperature of the water could vary from day to day, affecting how much sugar dissolves.

According to the graph, the least amount of sugar dissolved on day 3, while the most sugar dissolved on day 5. The difference in temperature on these days could explain this variation. On day 3, the water may have been cooler, making it more difficult for the sugar to dissolve. On the other hand, on day 5, the water may have been hotter, which could have increased the solubility of the sugar.

To increase the amount of sugar that dissolves in the tea, the student could try using hotter water or stirring the sugar more vigorously to distribute it evenly throughout the water. Alternatively, the student could try adding the sugar gradually while stirring to give it more time to dissolve before adding more.

Answer:

I'm not 100% sure on this because mine hasn't been graded yet, but here are the answers I submitted.

Explanation:

Which day the least sugar dissolved and which day the most sugar dissolved:

Day 4 is when the least sugar dissolved, and Day 2 is when the most sugar dissolved.

What could have caused less sugar to dissolve on some days:

The temperature of the tea could have caused the sugar not to dissolve on some days.

What the student could do to his drink to make more sugar dissolve.

The student would need to add the sugar to the tea as soon as it's done boiling.  The Sugar will dissolve faster in a warmer tea due to more energy of movement.  

Be sure to stir the tea as you add the sugar.  Stirring the sugar into the tea speeds up the rate of dissolving by helping distribute the sugar particles throughout the tea.  

If the student were to use granulated sugar, those are smaller particles and have greater surface area.  Greater surface area allows for more contact between the tea and the sugar.

Answer:

I HOPE IT HELPED THANKS

Answer: -354.78 kJ of energy would be released for a given amount.

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\)     ......(1)

For Zinc:

Mass of zinc = 50.0 g

Molar mass of zinc = 65.38 g/mol

Plugging values in equation 1:

\(\text{Moles of Zn}=\frac{50.0g}{65.38g/mol}=0.765mol\)

For oxygen gas:

Mass of oxygen gas = 30.0 g

Molar mass of oxygen gas = 32 g/mol

Plugging values in equation 1:

\(\text{Moles of }O_2=\frac{30.0g}{32g/mol}=0.9375mol\)

The chemical equation follows:

\(2ZnS(s)+3O_2(g)\rightarrow 2ZnO(s)+2SO_2(g);\Delta H=-927.54kJ\)

By the stoichiometry of the reaction:

If 2 moles of zinc reacts with 3 moles of oxygen gas

So, 0.765 moles of zinc will react with = \(\frac{3}{2}\times 0.765=0.51mol\) of oxygen gas

As the given amount of oxygen gas is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.

Thus, Zn is considered a limiting reagent because it limits the formation of the product.

By the stoichiometry of the reaction:

If 2 moles of zinc are releasing 927.54 kJ of energy

So, 0.765 moles of zinc will react with = \(\frac{927.54}{2}\times 0.765=354.78kJ\) of energy

Hence, -354.78 kJ of energy would be released for a given amount.

Answer:

choice 3

Explanation:

Hydrogen bonding occurs when a H is bonded to a highly electronegative atom like F. Towards the upper right corner, most atoms have high electronegativity and small atomic radii, according to periodic trends.

Please give thanks :)

Hydrogen is covalently bonded to an element that has a small atomic radius and high electronegativity.  

• An intermolecular attractive force in which an atom of hydrogen, which is bonded covalently to a small, highly electronegative atom is known as a hydrogen bond.  

• Hydrogen bonds are very strong in comparison to other dipole interactions.  

• A typical hydrogen bond exhibits a strength of about 5 percent of that of a covalent bond.  

• Hydrogen bonding takes place only in molecules where hydrogen bonding is bonded covalently to one of the three elements, that is, oxygen, fluorine, or nitrogen.  

Thus, correct answer is option 3.

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